Die stock



wuentoz KOS/4K0 SAV/"0 M@ K. SAITO DIE STOCK Filed Sept,

SePt- 19, 1933.

arrow/e115 Patented Sept. 19, 1933 UNITED STATES DIE STOCK Kosaku Saito, Osakimachi, Japan Application September 19, 1931, Serial No. 563,766, andin Japan July 7, 1931 3 Claims.

This invention relates to a die-stock, and is an improvement of the device of U. S. Patent No. 1,795,895.

In the prior patent, it was inconvenient to detachV or replace the dies because the springs which cooperate with the dies are arranged in the spaces between the sides of dies, their bending ends being attached to the adjacent sides of each die. Another drawback is that in the screw work the metal cutting scraps can not be completely removed from the dies because the metal scraps will penetrate into the space between the spring coils and will impede the action of the spring.

The object of this invention has object to eliminate these drawbacks.

The die-stock made in accordance with this invention is provided with a removable spring situated in a hollow handle and surrounding a movable pin carried by a slide which'is in contact with said spring. Due to this arrangement the spring and the die which is in contact with said pin may be easily removed and replaced by new ones, and the danger that small pieces of metal will prevent the spring from functioning properly is avoided.

In my above-mentioned Patent #1,795,895, the sliding pin acted against a die only after the slide was pushed by means of a feeding screw. According to my present invention the sliding Y pin is provided with a head engaging the side walls of a cavity formed inthe rear end of said die. However, the head of the sliding pin may be easily withdrawn from said cavity so that the die can be conveniently removed.

The invention is more particularly described and illustrated in the annexed drawing.

Figure 1 is a plan view of and partly a sectionk through the die-stock made according to the invention.

Figure 2 is a side View of and partly a section through the die-stock shown in Figure 1.

Figure 3 is a section along the line III-III in Figure 2.

Figures 4a and 4b are a section through and. an end view of the die, respectively.

Figures 5a and 5b are a section and an end View showing the connection oa sliding pin and a slide, respectively.

In the drawing, 15 is a spring pressing against` the slide 19 and surrounding a sliding pin 16 which is screwed into the slide 19 iitting in the hollow handle arm 12. An end 18 of the hexagonal head 17 of the sliding pin 16 is formed like the rivet-head, and is detachably engaging the ktom ofthe hollow handle.

walls of a cavity 28 provided at the rear end of l the die 13.

The cavity 28 is provided with side walls which project toward each other, as shown in Figure 4b.

The mouth and the bottom of the cavity 28 are 60 both elliptical, but of dilTerent axes, as shown in Figure 4a. The end 18 of the pin 13 ts into the cavity 28, as shown in Figures 1 and 2. While the device is being operated, the end 18 is pressed against the slanting side walls of the cavity 28, thus connecting the pin 16 with the die 13.

Due to the fact that the sliding pin 16 is eccentric with respect to the arm 12 and the slide 19, as shown in Figures 2, 5a and 5b, the vpin 16 and the slide 19 can be easily removed from the 70 die-stock.

The die-stock also comprises a feed Screw 2 which is in contact with a iiXed screw 3 situated within the hollow handle l2 and cooperating with a set screw 9. A guide pin 10 carried by the feed screw 2 is adapted to project out of an opening -ll formed in the grip 20 surrounding the handle l2. A plug 22 is screwed into thehollow handle 1 12 and may be adjusted within the handle.

This die-stock is operated in the same way as the die-stock 'described in my prior Patent I claim:

1. In a die-stock having hollow handles projecting from the opposite sides thereof, a separate slide in each one of said handles, a separate sliding pin adjustably connected with each one of said slides, a plurality of dies having cavities therein provided` with projecting walls, means connecting each one of the sliding pins with a separate die and adapted to engage a wall of the cavity of the die and a separate spring surrounding each sliding pin and pressing against the adjacent SIide, each sliding pin passing through a separate opening formed in the bottom of the hollow handle.

2. Ina die-stock having hollow handles prov jecting from the opposite sides thereof, a separate slide in each one of said handles, a separate of said slides, a plurality of dies provided with cavities, each one of said cavities having an opening and a bottom of different shapes, means connecting each one of the sliding pins with a separate die and adapted to engage a wall of thc cavity of the die, and a separate spring surrounding each sliding pin and pressing against the adjacent slide, each sliding pin passing through a separate opening formed in the botsurrounding each sliding pin and pressing against the adjacent slide, a separate pair of threaded screws interlocking each other and situated within each hollow handle, said screws being adapted to come in contact with said slides, and guide pins carried by said screws and projecting through elongated openings formed in the handles.

KOSAKU SAITO. 

